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fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-10-18T13:51:52.000Z" title="发表于 2023-10-18 21:51:52">2023-10-18</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">雅虎14条Web性能优化规则法则 1. 减少 HTTP 请求次数80%的最终用户响应时间花在前端程序上，而其大部分时间则花在各种页面元素， 如图像、 样式表、 脚本和 Flash 等，的下载上。 减少页面元素将会减少 HTTP 请求 次数。这是快速显示页面的关键所在。 一种减少页面元素个数的方法是简化页面设计。 但是否存在其他方式，能做到既有丰富内容，又能获得快速响应时间呢？以下是这样一些技术：Image maps 组合多个图片到一张图片中。总文件大小变化不大，但减少了 HTTP 请求次数从而加快了页面显示速度。该方式只适合图片连续的情况；同时坐标的定义是烦人又容易出错的工作。CSS Sprites 是更好的方法。它可以组合页面中的图片到单个文件中，并使用 CSS 的 background-image 和 background-position 属性来实现所需的部分图片。 Inline images 使用 data: URL scheme 来在页面中内嵌图片。这将增大 HTML 文件的大小。组合 inline images 到你的（缓存）样式表是既能较少 HTTP 请求， 又能避免加大 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/467cee4/" title="流形与非流行"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230708214917843.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="流形与非流行"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/467cee4/" title="流形与非流行">流形与非流行</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-07-08T13:45:31.000Z" title="发表于 2023-07-08 21:45:31">2023-07-08</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E5%AD%A6%E6%9C%AF/">学术</a></span></div><div class="content">

流形三角形网格（Manifold Triangle Mesh）和非流形网格（Non-Manifold Mesh）流形三角形网格（Manifold Triangle Mesh）和非流形网格（Non-Manifold Mesh）是在计算机图形学和几何处理中常见的两种网格类型。它们具有不同的特征和限制，对于不同的应用领域和算法，选择合适的网格类型是非常重要的。

流形三角形网格：流形三角形网格是一种拓扑上具有连续性和封闭性的网格。它的特征包括：

每个顶点最多与两个边和两个面相连。
每个边最多与两个面相连。
每个面最多与三条边和三个顶点相连。
网格中不存在孤立的顶点、边或面。

流形三角形网格常用于表示光滑曲面和可变形物体，它具有良好的几何性质和拓扑特征，适用于各种几何处理算法，如渲染、形状分析和物理模拟等。

非流形网格：非流形网格是一种拓扑上不具备连续性和封闭性的网格。它的特征包括：

顶点、边或面可以具有任意数量的相邻元素。
存在孤立的顶点、边或面。
边和面之间的连接关系可以是多对多的。

非流形网格常用于表示复杂的几何结构，如曲面上的孔洞、尖锐的边缘或非连续的形状。然而，由于其拓 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/f43726f7/" title="详解@RequestParam"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/Java-Logo.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="详解@RequestParam"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/f43726f7/" title="详解@RequestParam">详解@RequestParam</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-07-04T02:07:55.000Z" title="发表于 2023-07-04 10:07:55">2023-07-04</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">@RequestParam在Java中，@RequestParam 是一个注解，用于从HTTP请求中获取参数值。它通常用于Spring MVC框架中的控制器方法中，以指定方法参数应该绑定到HTTP请求中的特定参数。
@RequestParam 可以用于处理HTTP请求的查询参数、表单参数或路径参数。它可以应用于方法的参数或方法的参数上的注解。
下面是一些示例：

使用默认参数名称：

@GetMapping(&quot;/example&quot;)public String exampleMethod(@RequestParam String param) &#123;    // 方法体&#125;

上面的代码将尝试从HTTP请求中获取名为 “param” 的查询参数，并将其绑定到方法参数 param。

使用自定义参数名称：

@GetMapping(&quot;/example&quot;)public String exampleMethod(@RequestParam(&quot;customParam&quot;) String param) &#123;    //  ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/a98e3ede/" title="Cesium面试题"><img class="post-bg" src= "" data-lazy-src="/img/category_img.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Cesium面试题"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/a98e3ede/" title="Cesium面试题">Cesium面试题</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-07-03T06:07:01.000Z" title="发表于 2023-07-03 14:07:01">2023-07-03</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">
Cesium开发面试题1、请简要介绍一下Cesium的基本功能。答：Cesium是一款3D地球可视化引擎，可以在Web浏览器中显示高度真实感的3D地球场景，包括地形、地表纹理、3D建筑、水域等。它提供多种漫游和导航方式，支持多种地形和影像数据格式，以及3D Tiles、CZML等技术，可以用于实时位置追踪、天文数据显示、地下和空中场景等应用场景。
2、请解释一下Cesium中的3D Tiles技术是什么，以及它的作用是什么。  答：3D Tiles是一种用于高效地加载和显示大规模的3D地球数据的技术，可以将复杂的3D数据分层并进行高度优化。Cesium中的3D Tiles技术可以支持大规模的3D地球数据，包括城市、建筑、地形等，提高了数据的加载速度和显示效率。
3、CZML是Cesium中的一个数据格式，它是什么，以及它用于描述什么样的场景？  答：CZML（Cesium Language）是一种描述和显示动态的地球场景的数据格式，它可以用于描述航班轨迹、气象数据、卫星运行轨迹等。CZML中可以包含实体的位置、速度、方向等信息，以及可视化效果的设置。
4、请解释一下Cesium中的I ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/d594835b/" title="Linux项目部署详细步骤"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230709192449145.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Linux项目部署详细步骤"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/d594835b/" title="Linux项目部署详细步骤">Linux项目部署详细步骤</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-05-09T11:08:33.000Z" title="发表于 2023-05-09 19:08:33">2023-05-09</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">安装部署一、环境准备说明：如果已经安装过相关工具就忽略
1安装JAVA 运行环境第一步：上传或下载安装包
cd  /usr/local

jdk-8u152-linux-x64.tar.gz
第二步：解压安装包
tar -zxvf jdk-8u152-linux-x64.tar.gz

第三步：建立软连接
ln -s /usr/local/jdk1.8.0_152/  /usr/local/jdk 

第四步：修改环境变量
vim /etc/profileexport JAVA_HOME=/usr/local/jdkexport JRE_HOME=$JAVA_HOME/jreexport CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/libexport PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

通过命令source /etc/profile让profile文件立即生效source /etc/profile

第五步、测试是否安装成功
使用java -version，出现版本为java versio ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/undefined/" title="多边形"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230708212920053.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="多边形"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/undefined/" title="多边形">多边形</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-05-08T13:28:12.000Z" title="发表于 2023-05-08 21:28:12">2023-05-08</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E5%AD%A6%E6%9C%AF/">学术</a></span></div><div class="content">Voronoi 多边形
Voronoi 多边形，也称为 Voronoi 图或 Voronoi 分割，是一种空间分析和几何计算方法，用于将平面或空间划分为不同区域，每个区域都与给定一组点最近邻。这些区域被称为 Voronoi 多边形或 Voronoi 区域，每个多边形由与其对应的点作为最近邻点。
Voronoi 多边形的生成过程基于以下原则：给定一组点，每个点的 Voronoi 区域包含所有离该点最近的点，并且这些点之间的边界形成多边形。Voronoi 多边形的边界由平分相邻点之间的直线或曲线段组成，这些直线或曲线段是两个点之间的等距离线，也称为 Voronoi 边。因此，Voronoi 多边形的边界是相邻点之间的中垂线。
Voronoi 多边形在各种领域中有广泛应用，包括计算机图形学、计算机视觉、地理信息系统（GIS）、模式识别等。以下是一些应用 Voronoi 多边形的示例：

空间分析：Voronoi 多边形可用于将地理空间划分为不同的区域，每个区域都由最近邻点决定。这在地理学、城市规划和环境分析中具有重要作用，可以用于确定服务设施的服务范围、确定地理区域的边界等。

面积计算：通 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/fec612ee/" title="2.JS基础"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230722213120050.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="2.JS基础"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/fec612ee/" title="2.JS基础">2.JS基础</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-04-26T13:36:48.000Z" title="发表于 2023-04-26 21:36:48">2023-04-26</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">JS基础知识1.	javascript的typeof返回哪些数据类型   alert(typeof [1, 2]); //object    alert(typeof &#x27;leipeng&#x27;); //string    var i = true;     alert(typeof i); //boolean    alert(typeof 1); //number    var a;     alert(typeof a); //undefined    function a()&#123;;&#125;;alert(typeof a) //functiontypeof isNaN  function检测数组的几种方式：Array.isArray(arr);   es5Object.toString.call([]) === ‘object Array’arr instanceof Arrayarr.constructor === Array

2.	例举3种强制类型转换和2种隐式类型转换?强制（parseInt(),parseFloat(),Number()）隐式（& ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/e911cef5/" title="convex"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230708212656757.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="convex"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/e911cef5/" title="convex">convex</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-04-08T13:26:15.000Z" title="发表于 2023-04-08 21:26:15">2023-04-08</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E5%AD%A6%E6%9C%AF/">学术</a></span></div><div class="content">
平面地图综合中的convex hull+差分组合平面地图综合中的 “convex hull + 差分组合” 是一种常用的地理信息处理方法，用于合并多个重叠的平面地图数据集，以生成一个较大范围的一致地图。
首先，让我们解释一下 “convex hull” 和 “差分组合” 的含义：

Convex Hull（凸包）：凸包是一个几何概念，用于描述一个点集的最小凸多边形。对于给定的点集，凸包是包围这些点的最小凸形状，即没有凹陷的形状。在地图综合中，凸包可以用于找到每个地图数据集的边界。

差分组合：差分组合是指将两个或多个数据集进行差分操作，以便将它们合并成一个单一的数据集。在地图综合中，差分组合用于合并多个地图数据集，消除重叠和冗余部分。


现在我们来详细介绍 “convex hull + 差分组合” 的过程：

Convex Hull（凸包）：对于每个地图数据集，首先计算该数据集中所有点的凸包。这可以使用凸包算法，例如Graham扫描算法或Jarvis步进算法。凸包的边界定义了该数据集的外围形状。

差分操作：通过对每个地图数据集的凸包进行差分操作，可以消除重叠和冗余的部分。差分操作 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/posts/f4dabd3f/" title="八叉树结构"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230708212022408.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="八叉树结构"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/f4dabd3f/" title="八叉树结构">八叉树结构</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-04-08T13:12:55.000Z" title="发表于 2023-04-08 21:12:55">2023-04-08</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E5%AD%A6%E6%9C%AF/">学术</a></span></div><div class="content">八叉树结构八叉树（Octree）是一种常用的树型数据结构，它是二叉树在三维空间中的扩展。八叉树被广泛应用于计算机图形学、空间分区和体积渲染等领域，用于高效地表示和处理三维空间的数据。
八叉树的基本思想是将三维空间递归地划分为八个等大小的子空间，每个子空间称为一个八叉树节点（Octant）。这种划分方式类似于将立方体分成八个等大小的小立方体。每个节点可以有三种可能的状态：

叶节点（Leaf Node）：表示当前空间内存在数据或对象，不再继续划分。
空节点（Empty Node）：表示当前空间内不存在数据或对象，不再继续划分。
分支节点（Branch Node）：表示当前空间内可能存在数据或对象，需要进一步划分。

八叉树的构建过程从一个包含所有数据的根节点开始，根据数据的分布情况，逐层划分空间直到满足停止条件。停止条件可以是树的深度达到预定的最大深度，或者节点内的数据数量达到某个阈值。
八叉树的用法主要有以下几个方面：

空间分区：八叉树可以将三维空间划分为多个小空间，用于高效地管理和查询空间中的数据。在计算机图形学中，八叉树常被用来表示场景中的物体，以便进行快速的碰撞检测和可视化剔除 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/posts/169d769d/" title="前馈神经网路"><img class="post-bg" src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/%E5%8D%9A%E5%AE%A2/image-20230708205754393.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="前馈神经网路"></a></div><div class="recent-post-info"><a class="article-title" href="/posts/169d769d/" title="前馈神经网路">前馈神经网路</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-03-09T13:01:44.000Z" title="发表于 2023-03-09 21:01:44">2023-03-09</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E5%AD%A6%E6%9C%AF/">学术</a></span></div><div class="content">前馈神经网路1、简单介绍前馈神经网络（Feedforward Neural Network，简称FNN）是一种基本的神经网络模型，它最早由美国心理学家Rosenblatt在1958年提出，是最早的一种神经网络模型。FNN的每个神经元都是单向连接的，信号只能从输入层流向输出层，不存在反馈（recurrent）的过程，因此也被称为“无记忆神经网络”。
FNN由输入层、隐藏层和输出层构成，其中输入层接收外部输入，输出层输出结果，而隐藏层则负责处理输入层的信息，提取出特征并将其传递给输出层。隐藏层通常包含多个神经元，每个神经元都连接着上一层的所有神经元和下一层的所有神经元。FNN的输出是根据输入与每个神经元之间的连接权值进行计算得出的。
FNN的训练过程通常是基于反向传播算法（Back Propagation，简称BP算法），该算法利用梯度下降法对网络参数进行调整，使得网络的输出结果能够逐渐逼近期望的输出结果。BP算法的基本思想是将误差逐层反向传播，并根据误差值对网络参数进行调整，以达到误差最小化的目的。在实际应用中，常常需要对神经网络进行大量的训练，以提高网络的泛化能力。
FNN在模式识别、 ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/#content-inner">2</a><a class="extend next" rel="next" href="/page/2/#content-inner"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "" data-lazy-src="/img/adaver.png" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">GISer</div><div class="author-info__description">选择有时候比努力更重要</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">20</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">7</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">3</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/Jinhe404"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/Jinhe404" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="/jhcgnb@163.com" target="_blank" title="Email"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a><a class="social-icon" href="https://blog.csdn.net/weixin_44857463?type=blog" target="_blank" title="CSDN"><i class="fa fa-book-open"></i></a><a class="social-icon" href="tencent://AddContact/?fromId=45&amp;fromSubId=1&amp;subcmd=all&amp;uin=31025287432&amp;website=www.oicqzone.com" target="_blank" title="QQ"><i class="fab fa-qq"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">This is my Blog</div></div><div class="sticky_layout"><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/posts/5a9e107b/" title="11.性能优化"><img src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230722213120050.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="11.性能优化"/></a><div class="content"><a class="title" href="/posts/5a9e107b/" title="11.性能优化">11.性能优化</a><time datetime="2023-10-18T13:51:52.000Z" title="发表于 2023-10-18 21:51:52">2023-10-18</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/posts/467cee4/" title="流形与非流行"><img src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230708214917843.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="流形与非流行"/></a><div class="content"><a class="title" href="/posts/467cee4/" title="流形与非流行">流形与非流行</a><time datetime="2023-07-08T13:45:31.000Z" title="发表于 2023-07-08 21:45:31">2023-07-08</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/posts/f43726f7/" title="详解@RequestParam"><img src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/Java-Logo.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="详解@RequestParam"/></a><div class="content"><a class="title" href="/posts/f43726f7/" title="详解@RequestParam">详解@RequestParam</a><time datetime="2023-07-04T02:07:55.000Z" title="发表于 2023-07-04 10:07:55">2023-07-04</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/posts/a98e3ede/" title="Cesium面试题"><img src= "" data-lazy-src="/img/category_img.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Cesium面试题"/></a><div class="content"><a class="title" href="/posts/a98e3ede/" title="Cesium面试题">Cesium面试题</a><time datetime="2023-07-03T06:07:01.000Z" title="发表于 2023-07-03 14:07:01">2023-07-03</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/posts/d594835b/" title="Linux项目部署详细步骤"><img src= "" data-lazy-src="http://rx6zk4j2b.hn-bkt.clouddn.com/blogs/image-20230709192449145.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Linux项目部署详细步骤"/></a><div class="content"><a class="title" href="/posts/d594835b/" title="Linux项目部署详细步骤">Linux项目部署详细步骤</a><time datetime="2023-05-09T11:08:33.000Z" title="发表于 2023-05-09 19:08:33">2023-05-09</time></div></div></div></div><div class="card-widget card-categories"><div class="item-headline">
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